Evo filter-holder main plate is made of aluminum, making it both sturdy and light. Its modular design can hold up to 3 filters in scratch resistant Polyamid slots. A custom designed felt-like mask on the main base plate prevents light leaks during long exposures when using Cokin nuances or similar 2mm thick Glass filters. The included front plate allows a round screw-in EVO Circular polarizing filter (sold separately) to be attached. Designed to meet photographers’ expectations, EVO offers several configurations, by changing the number of slots (from one to three) or their thickness (up to 4mm). The EVA filter-holder is compatible with most Cokin creative adaptor rings and filters, So existing users can upgrade to the new EVO filter-holder without fear of increasing their filter investment. Adapter ring compatibility: m (P-Series) 49mm-62mm L (z-pro series) 52mm-95mm XL (x-pro series) 62mm-112mm note: The EVA filter holders are not compatible with the 164 Series Circular polarizers.